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A: Please confirm that your OS is right:
1. Due to downloading the wrong firmware, the OLED cannot be displayed. We '''ALSO''' made such mistakes during testing. This is '''NOT''' a hardware failure!
[[File:Pi4-V3-HAT.png|800px]]
2. Please check if the order of OLED screen pins is correct, please contact us if it's a wrong pin order; [[File:OLED-IMG-4373-1.jpg]] 3. Run the following command to check the I2C address: sudo i2cdetect -y 1 4. Then run the following command to enable OLED display:
rw
systemctl enable --now kvmd-oled